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Is it possible to figure out the parameter type and return type of a lambda?
...
Funny, I've just written a function_traits implementation based on Specializing a template on a lambda in C++0x which can give the parameter types. The trick, as described in the answer in that question, is to use the decltype of the lambda's operator().
te...
How can I use if/else in a dictionary comprehension?
...ict comprehension must have two expressions, separated by a colon:
{ (some_key if condition else default_key):(something_if_true if condition
else something_if_false) for key, value in dict_.items() }
The final if clause acts as a filter, which is different from having the conditional e...
Instance v state variables in react.js
...nter: function () {
// Open a new one after a delay
this._timeout = setTimeout(function () {
this.openWidget();
}.bind(this), DELAY);
},
handleLeave: function () {
// Clear the timeout for opening the widget
clearTimeout(this._timeout...
How to loop through a plain JavaScript object with the objects as members?
...
for (var key in validation_messages) {
// skip loop if the property is from prototype
if (!validation_messages.hasOwnProperty(key)) continue;
var obj = validation_messages[key];
for (var prop in obj) {
// skip loop if the prop...
See line breaks and carriage returns in editor
...ype file and no other line endings otherwise?
– alpha_989
May 25 '18 at 20:45
add a comment
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How to perform file system scanning
... if err != nil {
fmt.Println(err)
os.Exit(1)
}
for _, fi := range fi {
if fi.Mode().IsRegular() {
fmt.Println(fi.Name(), fi.Size(), "bytes")
}
}
}
share
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Compare two DataFrames and output their differences side-by-side
...True
dtype: bool
Then we can see which entries have changed:
In [23]: ne_stacked = (df1 != df2).stack()
In [24]: changed = ne_stacked[ne_stacked]
In [25]: changed.index.names = ['id', 'col']
In [26]: changed
Out[26]:
id col
1 score True
2 isEnrolled True
Comment True
...
iOS app error - Can't add self as subview
...So far this seems to have resolved the problem for us. Example:
id lock = _dataViewController.navigationController.navigationLock;
[[MyApi sharedClient] getUserProfile:_user.id success:^(MyUser *user) {
ProfileViewController *pvc = [[ProfileViewController alloc] initWithUser:user];
[_dataVi...
Why does my JavaScript code receive a “No 'Access-Control-Allow-Origin' header is present on the req
...U flask-cors
Then include the Flask cors in your application.
from flask_cors import CORS
A simple application will look like:
from flask import Flask
from flask_cors import CORS
app = Flask(__name__)
CORS(app)
@app.route("/")
def helloWorld():
return "Hello, cross-origin-world!"
For mor...
Installing libv8 gem on OS X 10.9+
...se the --with-system-v8 option.
Using RubyGems:
gem install libv8 [-v YOUR_VERSION] -- --with-system-v8
Using Bundler (in your Gemfile):
bundle config build.libv8 --with-system-v8
Please note that if you intend to run your own V8, you must install both V8 and its headers (found in libv8-dev for ...